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The challenge was identified when non-human sialic acid in the growth medium was found to compromise the potential employs of your embryonic stem cells in humans, Based on scientists on the University of California, San Diego.[eighty one]???, "????"? ?? ????? "????"? ?? ????? ?? ????.???? ??? ???? ???? ?? ??? ???? ??? ?????.?? ??? ????? ???? ??? ??

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